Improved mold for casting screw-heads



UNITED STATES PATENT OEEICE.

-NEVION S. VILLIAMS, OF EAST HAMPTON, CONAN.,ECXFICUTL IMPROVED MOLD FOR CASTING vSCREW-HEADS.

Specification forming part of Letters Patent No. 42,894, dated Mav 2l, 1864.

On the botto plate, B, there ae several raised cores, c c, vone foreach mold, arranged at equal distances apart in a circle. These l cores t easily to corresponding holes in the center plate, C, and are of a height to project the requisite distance above the upper sur- Oasting other Articles; and I do hereby deface of 'the plate C, which is perfectly even. cla-re that the following is a i'ull, clear, and The portions d a' ofthe molds which form the exact description'thereof, which will enable tops-and sides of the screw or nail heads or To all whom, z't may concern:

Be itknown that I, NEWTON S. WILLIAMS, of East Hampton, in the county of Middlesex and State of Connecticut, have invented a new and usefullmprovement in Molds for Casting Heads on Screws and Tacks and for others skilled in the art tomake and use the other articles to be castare formed in the unsame, reference being.f had to the accompanyder part of the top plate, D, in positions coring drawings, forming a part of this specitcation, in whichimpressions or partial depressions areintended Figure l -is a central vertical section of a to be produced in the tops of said articles- 'mold for casting compositionmetal heads on as, for instance. the notches in screw-headsscrews. Fig. 2 is a verticalsection of part of the plate may be drilled through from the responding with thehcores c c, and when any the mold at right angles to Fig. 1. Fig. 3 is said portions d d of the moldand have cores' a horizontal section in the plane indicated by e c of the necessary form inserted firmly into the line x in' Fig. 1. Fig. 4 is a central verthem. The top plate is also made'with a cen- -ticalsection of one ofthe screws. tral stem or socket, E,- which is bored out Similar letters of reference 4indicate the with an upward taper to produce the cen- Sameparts ,tral or main runner,f, and in the under sur- This invention relates to molds of cast-iron face of the said plate there are formed grooves or other metal for casting several articles at g g, radiating from the said main runner to a time. 1 form branch runners leading to the several It consists, rst, in ythe combination, with molds. several molds arranged in a circle, .of a single For casting heads ou screws or nails there central runnerwhich tapers in an upward diare central holes, h h, provided iu the pores c rection to the mouth, and branch runners ra,- cfor the reception of the screws or nails, as diating from the said main runner to supply shown in Figs. 1, 2, and 3. Screws are shown the 'several molds at the same time therefrom, in red outline in Fig. 1,A and in. black outline' whereby the metal is enabled torun in a-uni in Fig. 3 inserted into these holes;

formly fluid state to the several molds and the F 1s a horizontal cross-head arranged below necessary facility for parting the several molds the platform 0r bench A, and having attached is aiorded. to it three or more up'ght pins,.I I, which It consists, secondly, in certain novel means pass freely through holes in the said platform wherebyv the parting ofthe several molds `f or or bench, and through holes -in the bottom the removal ofthe castings is eii'ected more plate, B, and 'central plate, C. The holes in easily and expeditiously., l the bottom plate are larger than those in the B, C, and D are three horizontal castirou center plate, and the upper portions, i z', ofthe or othermeta-l plates of which the molds are 'pins I I are of a size to fit the holes in the cencomposed,arranged one above another and ter plate, and theportions j j below of asize fitting closely together. The bottom plate', B, to tthe bottom plate; but the smaller portions is firmly secured by one or more screw-bolts,

i i are of 'a length considerably greater than a, to a horizontal platform or bench, A'. The

the thickness of the center plate. Square center plate, C, and the topplate, D, arekept shoulders 7c k are left between the portions i' inI central positions upon the bottom plate, B, and j .j of the said pins. This crosshead is by. means of upright steady-pins b b, secured 4supported by a centralstem, H, which is seinthe bottom plate l andpassingthrough holes cured rmly into it, and which worksin a in the first and second plates, in which they guide, J, secured upon the base K,upon which fit easily'to-permit those'plates to be easily the platform or bench A is rigidly secured, lifted.

and this rod H has a trealdle, G, so applied to 'y it that it may be'raised by the pressure of the by arranging` the tack or screw molds inarow foot upon the said treadle. The weight of the said stem, cross-head, and pins is sufficient to bring them down again when the pressure of the foot is removed from the treadle.

The operation of casting the heads on the screws is as follows: The operator first takes offthc plate'D, then places the screws in the holes h. 71, and afterward replaces the plate. He. next pours the molten metal into the main 0r central runner, f, whence it runs equallyr and at the same time tl'irough all the branch runners y y into the molds, continuing to pour l until the main runner is nearly full. As the metal contracts in the severa-l molds in cool-- ing more metal is supplied by the weightaol" the headcontained in the main ruimer. When the metal is set inthe molds, which he will know by experience,v the operatorby one press ure of the foot upon the treadle so raises the post H, crossliead F, and pinsl as iirst to litt up the top plate, l), from the work ready to be removed, which is rendered easy by the upward-tapering form of the runner j", which is the reverse ofthe usual forni of the ruimer, and afterward by the same operation of the treadle to lift up the center plate, (I, high enouglrto free the work from the cores c c. This part of the opcrationis rendered necessary by the close adhesion of themetal to the cores c c, caused by contraction in cooling. After the work is removed and 'tlie'foottaken from the treadle the center plate, C, falls back by its own Weight to its .proper place. Xcw

screws are next 'placed in the holes 71 l1, and

the plates C and vD replaced, and the casting may be repeated; Other articles made oi a su lli- 'ciently fusible metal or, alloy may be east in the same way.

rlhe old method of casting tack'and screw headsand that which is nowin general use, is

to be supplied with metal from a leader Vrun` ning parallel with it. The long narrow mold is inclined to an angle of about forty-five degrees and the metal poured in at the end. The screw and tack heads thus cast prove, on being turned in a lathe to finish them, to be unlike and imperfect in their texture arising from the different head or pressure'of metal above each mold or the position of the mold.

Moreover, -the heads thus cast are taken from y the mold with much difficulty.

The great advantage of this invention in casting screwand tack heads is. that all the molds being in the same horizontal planesand equidistant. from the main runner, the castings 'are uniform and have the solidity, the want of which caused much difficulty and bad work in the old way, and has induced 4some manu.

,facturers to adopt the more expensive process of pressing or stamping the heads after they are cast. Another advantage is that the process of casting is much more quickly and easily performed.

XVhat I claim as my invention, and desire to secure by Letters Patent, is-

1. The central main runncr,f, tapering in an upward direction, inv combination with the radiating branch runners g g, and the concentric circularly-arranged series of molds, substantially' as herein specified.

rlhe post II, cross-head1?, and attached pins l I, or their equivalents, in -combination with the three plates B C D, for the purpose of raising` the plates 1) and C one after the other, substantially as herein specified.

NEWTON S. VILLIAMS.

-Witnesses: A

J. W. CooMns, lliaxnvfl. Bnowx. 

